The Frucall service allows you to set up "buddy lists" of your friends and co-workers - anybody with whom you have common interest or do things, such as your shopping buddies, your movie buddies, etc. You can then send your buddies voice or text messages, i.e., a group message to everybody at the same time.
In order to use your buddy lists, you should first log into your Frucall account.
Do not have an account? Sign Up Now. It's free!